Peripheral Simulation

VTREGs (Virtual Target Registers) which support I/O with the peripheral.

These simulation capabilities are described below.

CLOCK VTREGData Type: unsigned long

The CLOCK VTREG contains the speed of the microcontroller
instruction clock (in Hertz). This is effectively the number of
1-cycle instructions that the simulated microcontroller can execute
each second. This number is derived by dividing the oscillator
frequency (specified by the XTAL VTREG) by a fixed number (12 on
standard 8051 devices). The CLOCK VTREG can only be read. It can be
changed directly. It can only be changed by changing the value of the
XTAL VTREG or by changing the clock divisor (which is not available
on all devices).

XTAL VTREGData Type: unsigned long

The XTAL VTREG contains the frequency of the oscillator (in Hertz)
used to drive the microcontroller. The value is automatically set
from the value specified in Project Options - Options for Target.
However, you may change the value of XTAL using the command window.
For example:

XTAL=12000000

You may also output the current value of XTAL using the
following:

XTAL

XTAL may be used in calculations to synchronize external scripts
with the simulated microcontroller

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